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Simplifying 7a + 28 = 4a + 7 Reorder the terms: 28 + 7a = 4a + 7 Reorder the terms: 28 + 7a = 7 + 4a Solving 28 + 7a = 7 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 28 + 7a + -4a = 7 + 4a + -4a Combine like terms: 7a + -4a = 3a 28 + 3a = 7 + 4a + -4a Combine like terms: 4a + -4a = 0 28 + 3a = 7 + 0 28 + 3a = 7 Add '-28' to each side of the equation. 28 + -28 + 3a = 7 + -28 Combine like terms: 28 + -28 = 0 0 + 3a = 7 + -28 3a = 7 + -28 Combine like terms: 7 + -28 = -21 3a = -21 Divide each side by '3'. a = -7 Simplifying a = -7
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